2 * Copyright 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.client.android;
19 import android.app.Activity;
20 import android.app.AlertDialog;
21 import android.content.DialogInterface;
22 import android.content.Intent;
23 import android.net.Uri;
24 import android.os.Build;
25 import android.os.Bundle;
26 import android.util.Log;
27 import android.view.View;
28 import android.view.KeyEvent;
29 import android.webkit.WebView;
30 import android.webkit.WebViewClient;
31 import android.widget.Button;
34 * An HTML-based help screen with Back and Done buttons at the bottom.
36 * @author dswitkin@google.com (Daniel Switkin)
38 public final class HelpActivity extends Activity {
40 private static final String TAG = HelpActivity.class.getName();
42 private static final String[] BUGGY_MODEL_SUBSTRINGS = {"Behold II", "Pulse"};
43 private static final Uri BUGGY_URI =
44 Uri.parse("http://code.google.com/p/zxing/wiki/FrequentlyAskedQuestions");
46 // Use this key and one of the values below when launching this activity via intent. If not
47 // present, the default page will be loaded.
48 public static final String REQUESTED_PAGE_KEY = "requested_page_key";
49 public static final String DEFAULT_PAGE = "index.html";
50 public static final String WHATS_NEW_PAGE = "whatsnew.html";
51 private static final String BASE_URL = "file:///android_asset/html/";
53 private WebView webView;
54 private Button backButton;
56 private final Button.OnClickListener backListener = new Button.OnClickListener() {
57 public void onClick(View view) {
62 private final Button.OnClickListener doneListener = new Button.OnClickListener() {
63 public void onClick(View view) {
68 private final DialogInterface.OnClickListener groupsListener =
69 new DialogInterface.OnClickListener() {
70 public void onClick(DialogInterface dialogInterface, int i) {
71 Intent intent = new Intent(Intent.ACTION_VIEW, BUGGY_URI);
72 intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
73 HelpActivity.this.startActivity(intent);
78 protected void onCreate(Bundle icicle) {
79 super.onCreate(icicle);
80 setContentView(R.layout.help);
82 webView = (WebView)findViewById(R.id.help_contents);
83 webView.setWebViewClient(new HelpClient());
85 Intent intent = getIntent();
87 webView.restoreState(icicle);
88 } else if (intent != null) {
89 String page = intent.getStringExtra(REQUESTED_PAGE_KEY);
90 if (page != null && page.length() > 0) {
91 webView.loadUrl(BASE_URL + page);
93 webView.loadUrl(BASE_URL + DEFAULT_PAGE);
96 webView.loadUrl(BASE_URL + DEFAULT_PAGE);
99 backButton = (Button)findViewById(R.id.back_button);
100 backButton.setOnClickListener(backListener);
101 Button doneButton = (Button)findViewById(R.id.done_button);
102 doneButton.setOnClickListener(doneListener);
106 public void onResume() {
111 private void checkBuggyDevice() {
112 String model = Build.MODEL;
113 Log.i(TAG, "Build model is " + model);
115 for (String buggyModelSubstring : BUGGY_MODEL_SUBSTRINGS) {
116 if (model.contains(buggyModelSubstring)) {
117 AlertDialog.Builder builder = new AlertDialog.Builder(this);
118 builder.setMessage(R.string.msg_buggy);
119 builder.setPositiveButton(R.string.button_ok, groupsListener);
120 builder.setNegativeButton(R.string.button_cancel, null);
121 builder.create().show();
129 protected void onSaveInstanceState(Bundle state) {
130 webView.saveState(state);
134 public boolean onKeyDown(int keyCode, KeyEvent event) {
135 if (keyCode == KeyEvent.KEYCODE_BACK) {
136 if (webView.canGoBack()) {
141 return super.onKeyDown(keyCode, event);
144 private final class HelpClient extends WebViewClient {
146 public void onPageFinished(WebView view, String url) {
147 setTitle(view.getTitle());
148 backButton.setEnabled(view.canGoBack());